import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'
import Welcome from '../components/Welcome.vue'
import Users from '../components/user/Users.vue'
import Rights from '../components/power/Rights.vue'
import Roles from '../components/power/Roles.vue'
Vue.use(VueRouter)

const router =  new VueRouter({
  routes:[
    {
      path:'/',
      redirect:'/login'
    },
    {
      path:'/login',
      component:Login
    },{
      path:'/home',
      component:Home,
      redirect:'/welcome',
      children:[
        {
          path:'/welcome',
          component:Welcome
        },
        {
          path:'/users',
          component:Users
        },
        {
          path:'/rights',
          component:Rights
        },
        {
          path:'/roles',
          component:Roles
        }
      ]
    }
  ]
})

// 挂载路由导航守卫
router.beforeEach((to, from, next) => {
  // to 代表将要访问的路径
  // from 代表从哪个路径跳转而来
  // next 是一个放行函数
  //  next() 放行     next('/login') 强制跳转
  if(to.path === '/login') return next()
  // 获取token
  const tokenStr = window.sessionStorage.getItem('token')
  if(!tokenStr) return next('/login')
  next()
})

export default router
